Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - New Accounting Standards (Details)

v3.20.4
Summary of Significant Accounting Principles - New Accounting Standards (Details) - USD ($)
$ in Millions
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative adjustment for hedge accounting change   $ 272,924 $ 264,810 $ 265,325 $ 267,146
Allowance for credit losses   20,680 10,229 10,398  
Retained earnings   $ (164,088) (156,319)    
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative adjustment for hedge accounting change     (2,406) $ 165  
Allowance for credit losses $ 3,300   3,300    
Loans and leases receivable, percentage increase in allowance 32.00%        
Retained earnings     $ 2,400